2. 职称英语
  3. Since there is such an abundance of food in the sea, it is understandable th

Since there is such an abundance of food in the sea, it is understandable th

游客2023-07-24  45
问题     Since there is such an abundance of food in the sea, it is understandable that some of the efficient, highly adaptable, warm-blooded mammals that【C1】______on land should have returned to the sea. Those that【C2】______have flourished. Within about 50 million years--【C3】______time at all, geologically speaking--one of the four kinds of mammals that has【C4】______to a marine environment has developed into the largest of all animal【C5】______, the whale. A second kind, the seal, has produced what is probably the greatest population of large carnivorous mammals on Earth.
    This suggests that these "top dogs" of the ocean are【C6】______and multiplying.【C7】______, such has not been the case, at ieast not for the last 150 years. Trouble has closed in【C8】______these mammals in the form of equally warm-blooded and even more【C9】______adaptable predators, humans.  At sea,【C10】______on land, humans have now【C11】______themselves on the top of the whole great pyramid of life, and【C12】______have caused serious problems for the mammals of the sea, There is a simple【C13】______for this.
【C14】______mammals have the misfortune to be swimming aggregates of【C15】______that humans want: fur, oil and meat. Even so, they might not be so【C16】______to human depredation if they did not, like humans,【C17】______so slowly.
    Every year humans【C18】______more than 50 million tons of fish from the oceans without critically depleting the population of any【C19】______. But the slowbreeding mammals of the sea have been all but wiped out by humans【C20】______satisfy their wants and whims. [br] 【C13】
选项 A、definition
B、reason
C、question
D、doubt
答案 B
解析 前文说明目前人类已处在食物链的顶端，给海洋哺乳动物带来了巨大的威胁。该段意在阐述原因，如后文提到的皮毛，油，肉等都是人类需要的商品。故此处应为“原因很简单”，应选择reason。definition意为“定义”；question意为“问题”；doubt意为“怀疑”，放在此处均不合适。
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